Chime Financial Set to Join S&P MidCap 400

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Chime Financial (CHYM) will replace NorthWestern Energy Group in the S&P MidCap 400 before trading opens on November 18, 2026.

Black Hills (BKH), already an index constituent, is acquiring NorthWestern Energy Group (NWE), with completion expected November 13, 2026. After the merger, the combined company will remain in the index and be renamed Bright Horizon Energy (HZN). The index changes classify Chime in the Financials sector and remove NorthWestern Energy Group from Utilities.

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11/13/2026 - 06:18 PM EST

NEW YORK, Nov. 13, 2026 /PRNewswire/ -- Chime Financial Inc. (NASD: CHYM) will replace NorthWestern Energy Group Inc. (NASD: NWE) in the S&P MidCap 400 effective prior to the opening of trading on Wednesday, November 18. S&P MidCap 400 constituent Black Hills Corp. (NYSE: BKH) is acquiring NorthWestern Energy Group in a deal expected to be completed today. Post-merger, the combined company will remain in the S&P MidCap 400 and will be renamed Bright Horizon Energy Corp. (NYSE: HZN).

Following is a summary of the changes that will take place prior to the open of trading on the effective date:

Effective Date	Index Name	Action	Company Name	Ticker	GICS Sector
November 18, 2026	S&P MidCap 400	Addition	Chime Financial	CHYM	Financials
November 18, 2026	S&P MidCap 400	Deletion	NorthWestern Energy Group	NWE	Utilities

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